76 REPORT OF NEW JERSEY STATE MUSEUM. 



quite narrow posterior extremity. Ventral edge nearly straight, 

 slightly sinuate just posterior to middle. Viewed from^ above 

 shell tumid, oval, widest in middle, tapers somewhat more rap- 

 idly anteriorly. Dark dorsal coloration appearing in form of 

 rough cross. Longest of natatory setae reach but slightly beyond 

 terminal claws. First pair of maxillae slender, weakly developed, 

 and spines in its first process' toothed. Second foot long, slender, 

 terminal claws covered, slender, twice as long as terminal seg- 

 ment. Caudal rami straight, weakly bent near t-nd, from' ten to 

 twelve times long as wide, and very faintly toothed on dorsal 

 edge. Terminal claw sjender, straight, finely tooth'ed at extrem- 

 ity, nearly three-fifths long as ramus. Siib-terniinal claw five- 

 sevenths long as terminal claw, straight. Terminal seta slender, 

 short, of same length as dorsal one, which one-third length of 

 sub-terminal claw and distant from, it width of ramus. Color 

 clear yellowish to translucent, with dark blue patch dorsally and 

 just posterior to eye-spot. Strikingly sculptured formi of shell 

 especially noticeable in yoimg stages. This sculpturing resembles 

 striations at center O'f shell, changing to radially arranged pat- 

 terns, resembling filagree work. Occasionally in old specimens 

 this absent. Length 1.25 mm. (Sharpe.) 



Remarks. — Known fromi New Jersey by Sharpe's record. It 

 occurs mostly in northern Europe and lives in small grassy pools. 



Sub-Pa inily Cyclocypridin.^. 



Natatory setae very long, usually twice as long as distance from 

 their origin to tips of end claws. Second feet with three setae, 

 one long, the other two rather short and backwardh^ directed. 

 Furca usually normal. 



Key to the genera. 



a. Terminal segment of second pair of feet two-thirds long as fourth 



segment. cyci,ocypris 



aa. Terminal segment of second pair cf feet one-fourth as long as fourth 



segment. cypria 



